JPH09108950A - Wire electrode inserting method of wire cut electric discharge machining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to make an accurate judgment of emergence and solution of an incapable condition of inserting a wire electrode into a workpiece by judging on the basis of detecting whether the wire electrode is buckled or not after sending out the wire electrode of a length passing through the workpiece. SOLUTION: After sending out a wire electrode downward by making a roller device 20 make positive rotation, existance of a wire electrode buckling is discriminately judged by a buckling sensor 19. When a buckling is detected, there is a catch occurring to the end of the wire electrode on a traveling path from the bottom side of the workpiece 3 to a catch-and-collect mechanism 22, which means that the wire electrode is being impeded of proceeding. In such case, the roller device 20 is stopped, and, if the number of practiced times of a try operation have not reach a set number of times, the wire electrode is wound up by rotating the roller device 20 in reverse.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically mounting a wire electrode on a predetermined traveling path by inserting the wire electrode into a workpiece in a wire cut electric discharge machine.

[0002]

2. Description of the Related Art A fine wire-shaped wire electrode unwound from a supply reel is mounted on a predetermined traveling path to a capturing / recovering mechanism, and a wire electrode traveling axially at a predetermined tension and speed is processed. The workpiece is positioned in the Z-axis direction orthogonal to the XY plane on which the workpiece is fixedly mounted by a pair of positioning guides provided on both sides of the workpiece, and the machining liquid is placed in the machining gap between the opposing wire electrode and the workpiece. A wire-cut electric discharge machine that, while supplied, intermittently applies a voltage pulse between the two to generate electric discharge repeatedly and also gives a relative machining feed on the XY plane to machine a desired contour shape. When mounting or re-mounting the wire electrode in the traveling path at the start of processing or when the wire electrode is broken, it is necessary to insert the wire electrode into the processing start hole formed in the workpiece or the already processed groove. There Kerf number to the diameter of the wire electrode 1
Needless to say, it is difficult to insert the wire electrode because the width is about 0 μm, and the processing start hole is usually limited to 1 due to restrictions due to the processing contour shape and processing time for hole formation.
There are many cases where the diameter is about mmφ and 1 mmφ or less. Normally, automatically inserting a wire electrode having a diameter of about 0.05 to 0.5 mmφ into such a small hole is wound around the wire electrode on a reel. Since there is a curl due to the fact that there is a distortion caused in the manufacturing process and the wire electrode is not always sent straight out, it is difficult to maintain straightness, especially when the wire electrode is extremely fine. Because of this, automatic insertion was difficult. For this reason, conventionally, for example, Japanese Unexamined Patent Publication Nos. 2-311221 and 4-1413.
No. 22, and Japanese Patent Laid-Open No. 2-116424, the machining electrode is jetted at a high speed coaxially with the planned passage path of the wire electrode, and the wire electrode is restrained in the jet flow. The wire electrode is inserted into the work piece while maintaining its straightness, and when the wire electrode comes into contact with the upper surface of the work piece and the insertion fails, the contact state of the wire electrode and the work piece is automatically A method has been proposed in which the wire electrode is eliminated and the wire electrode is inserted into the workpiece.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the method described in Japanese Patent Laid-Open No. 221 and JP-A-4-141322, a wire electrode is pressed and sandwiched by a roller toward a work piece in a jet flow jetting state, and the wire electrode comes into contact with the work piece. When this is detected, feeding of the wire electrode is stopped in a state where the wire electrode is slightly bent by the detection signal, and the wire electrode and the workpiece are relatively moved to move the tip of the wire electrode to the workpiece. This is a method in which the wire electrode is inserted into the processing start hole or the processing groove, the relative movement is stopped by the signal that the contact is eliminated, the feeding of the wire electrode is restarted, and the wire electrode is inserted into the workpiece. In this conventional method, the wire electrode insertion failure (the appearance of the inability to insert the wire electrode) is determined by an electrical contact detection signal between the wire electrode and the workpiece. As described above, the tip of the wire electrode is not always located at the center of the jet flow, and the wire electrode moves with the tip swaying due to the jet flow. Or when inserting it into the processing groove,
In many cases, even if the wire electrode has successfully entered the inside from the entrance of the hole or the like, the tip of the wire electrode may temporarily contact the inner surface of the hole or the like or move while sliding on the inner surface. According to this, even if such insertion is possible, the insertion failure will be determined, and the insertion failure cannot be accurately determined. Further, in this conventional method, even when the insertion failure is correctly detected, the wire electrode is slightly bent and the presence or absence of contact is detected with the tip of the wire electrode abutting against the upper surface of the workpiece. When the workpiece is relatively moved, contact detection is unstable such that a non-contact signal is output even if the tip of the wire electrode jumps due to minute unevenness, and relative movement causes the wire electrode to move. Even when the tip enters a small amount of bending, which is a bending amount, into the processing start hole, etc., the contact state may not be eliminated depending on the bending property of the wire electrode tip, and the elimination of the inability to insert can be accurately detected. I can't. Furthermore, even if the wire electrode is restarted when the non-contact state is detected by entering the processing start hole or the like, the tip of the wire electrode is slightly moved to the inner surface of the processing start hole or the like by the feeding by the rotation of the roller. Even if it is caught in the area, there is a high risk that it will not be able to proceed and it will not be possible to insert it.

Further, in Japanese Patent Laid-Open No. 2-116424, a wire guide is arranged near a top surface of a workpiece so as to be coaxial with a machining start hole, and a wire electrode which is pressed and clamped by a roller and sent out. Guided by the pipe guide, when the tip of the wire electrode is caught on the upper surface of the work piece or the inner side surface of the processing start hole and cannot move, the slack that occurs in the wire electrode due to continuous feeding is provided above the pipe guide. Detected by the buckling sensor, the roller is reversely rotated by the detection signal to loosen the wire electrode at the upper part of the roller, release the pressure clamping by the roller to make the wire electrode free state, and supply the working fluid into the pipe guide. The jet ejected from the tip of the pipe guide by lowering the tip of the wire electrode in the free state with the flow of the machining liquid by discharging it toward the machining start hole. The method for inserting the machining starting hole in a state in which constraints are described by. According to this conventional method, insertion failure is detected because the wire electrode is sufficiently loosened due to the contact between the wire electrode and the buckling sensor, not the contact between the wire electrode and the workpiece. There is no mistake in determining the appearance of the state (insertion failure) and the elimination of the state. Moreover, since the wire electrode in a sufficiently loosened and free state is ejected at a speed extremely higher than the rotation speed of the roller by the jet flow, if the tip of the wire electrode once enters the hole. Even if some catching occurs on the inner side surface, the movement is not stopped there, and the movement progresses all at once to the exit of the hole. However, if the tip of the wire electrode enters the hole,
If the conditions such as the positional relationship between the pipe guide and the processing start hole are the same, the tip of the wire electrode is likely to be caught on the upper surface of the workpiece in the same manner, and the probability of successful insertion cannot be sufficiently increased. In addition, none of the above-mentioned conventional techniques can automatically mount the wire electrode on a predetermined traveling path from the supply reel to the capturing and collecting mechanism in a desired state.

In view of the above problems of the conventional method, the present invention is capable of accurately discriminating and detecting the appearance of the inability to insert the wire electrode into the workpiece and the elimination of the state without error. , When the impenetrable state appears,
It is an object of the present invention to provide a method capable of automatically eliminating this state and inserting a wire electrode into a work piece and mounting the wire electrode on a predetermined traveling route with a high probability and in a desired state.

[0006]

In order to achieve this object, the first invention of the present invention provides a pair of positioning guides on both sides of a workpiece fixedly mounted on an XY plane. The fine wire-shaped wire electrode mounted on the predetermined traveling path from the supply reel to the capturing and collecting mechanism while being positioned in the Z-axis direction orthogonal to the XY plane by the positioning guide of FIG. While traveling in the axial direction with a predetermined tension and speed and supplying the machining liquid to the machining gap between the wire electrode and the workpiece, intermittently applying a voltage pulse between them to generate repeated discharge. A wire-cut electric discharge machine for machining a desired contour shape by giving a relative machining feed on an XY plane, wherein the pair of positioning is performed by a cylindrical body having an inlet end and an outlet end of a wire electrode at both ends. Coaxial with guide And a pipe-shaped wire electrode guide body which is arranged so as to be movable in the Z-axis direction and to which a pressurized fluid is supplied from the vicinity of the inlet end to eject a jet flow from the outlet end, and which is provided on the inlet end side of the wire electrode guide body. A roller device that presses and clamps the wire electrode and sends it in the axial direction; a buckling sensor that is provided between the entrance end of the wire electrode guide and the roller device and that detects the buckling of the wire electrode; In a method of inserting a wire electrode in a wire cut electric discharge machine including a wire disconnection detection device for detecting a tension state of the wire electrode above and a cutting device for cutting the wire electrode at a predetermined position, (a) After cutting the wire electrode at a predetermined position with a cutting device, the wire electrode guide body is moved in the Z-axis direction to a position where the outlet end is close to the workpiece, and then the roller device is closed. It said supplying pressurized fluid to the wire electrode guide body is ejected jet flow from the outlet end of the guide body with pressed sandwiching the Ya electrodes,
(b) The roller device is normally rotated to feed the wire electrode toward the wire electrode guide body, and (c) the wire electrode is fed to a length such that the tip of the wire electrode passes through the machining start hole of the workpiece, and then the wire electrode is fed. The presence or absence of buckling of the wire electrode is discriminated and detected by the buckling sensor, and (d) when the wire electrode buckling is not detected in the item (c), the length of time until the wire electrode tip reaches the wire electrode capturing and collecting mechanism. While further sending, the presence or absence of buckling of the wire electrode is detected and discriminated by the buckling sensor. (E) When buckling of the wire electrode is detected in (c), the roller device is stopped, (f) It is determined whether the buckling detection is canceled while applying a predetermined relative movement of a predetermined pattern on the XY plane between the wire electrode guide body and the workpiece, and (g) the item (f) above. If the buckling detection does not disappear until the relative movement of the specified pattern is completed, the phase of the specified pattern Repeat set number of mobile, (h) the (f) When the elimination of the seat 屈検 knowledge is discriminated in section, after returning to the relative movement start position of the predetermined pattern,
The roller device is normally rotated to detect the presence or absence of buckling of the wire electrode while sending the length of the wire electrode tip until it reaches the wire electrode capturing and collecting mechanism, and (i) If buckling of the wire electrode is not detected in paragraphs (d) or (h), after the roller device is opened and stopped, the mounting state of the wire electrode on the traveling route is detected by the wire disconnection detection device. Discriminate, (j) above (i)
When it is determined that the wire electrode is mounted on the traveling path with a predetermined tension in the item, it is determined that the insertion is successful,
(k) When buckling of the wire electrode is detected in (d) or (h) above, or even when the relative movement of the predetermined pattern is repeated a set number of times in (g) above, buckling detection does not disappear. In this case, or when it is not determined in (i) that the wire electrode is mounted on the traveling path with a predetermined tension, the roller device is reversely rotated to wind the wire electrode, and
Repeat the operation after the item (b) a set number of times, and if the insertion success is not determined even after repeating the set number of times, the insertion failure is determined,
It is characterized by the following.

The second invention of the present invention is, on the XY plane set in advance, after (f) the jet flow is stopped, following the operation procedure of the above (e) in the first invention. After moving the wire electrode guide body and the workpiece relative to the next point of the predetermined pattern of, the jet flow is jetted to determine whether the buckling detection is eliminated, and (g) In the (f) section, When it is not determined that the buckling detection is resolved, the operation of the above (f) is repeated until the relative movement of the predetermined pattern ends, and (h) the buckling detection is performed until the relative movement of the predetermined pattern ends in the above (g). If the problem is not resolved, the relative movement of the predetermined pattern according to the items (f) and (g) is repeated a set number of times, and (i) if the cancellation of the buckling detection is determined in the item (f), the After returning to the relative movement start point, the roller device is normally rotated so that the tip of the wire electrode captures and collects the wire electrode. When the wire electrode buckling is detected by the buckling sensor while sending further, the wire electrode buckling is not detected in (j) (d) or (i) above. After the roller device is opened and then stopped, the mounting state of the wire electrode on the travel route is determined by the wire disconnection detection device. (K) In the item (j), the wire electrode is moved to the travel route. If it is determined that the wire electrode is mounted with a predetermined tension above, it is determined that the insertion is successful, and (l) When buckling of the wire electrode is detected in (d) or (i), Alternatively, when the buckling detection is not resolved even after repeating the relative movement of the predetermined pattern for the set number of times in the above (h), or when the wire electrode is mounted on the traveling route with a predetermined tension in the above (j). If it is not determined that the roller device is reversely rotated to wind up the wire electrode, Serial (b) repeatedly set number of times the operation of the subsequent paragraphs,
It is characterized in that the insertion failure is determined when the insertion success is not determined even after repeating the set number of times.

Further, in the third invention of the present invention, following the operation procedure of the item (e) in the first invention, (f) the roller device is rotated in the reverse direction so that the tip of the wire electrode is guided by the wire electrode guide. After winding the wire electrode until it is located inside the body, the wire electrode guide body and the workpiece are relatively moved to the next point of the predetermined pattern on the XY plane set in advance, and then the roller device is opened. If the elimination of buckling detection is determined as the state, and (g) the elimination of buckling detection is not determined in the item (f), then the above-mentioned until the relative movement of the predetermined pattern is completed,
If the operation in (f) is repeated and (b) the buckling detection is not resolved until the relative movement of the predetermined pattern in (g) above is completed,
The relative movement of the predetermined pattern according to the items (f) and (g) is repeated a set number of times, and (i) when it is determined that the buckling detection is eliminated in the item (f), the relative movement start point is returned. After that, the roller device is rotated in the forward direction, and the length until the wire electrode tip reaches the wire electrode capturing and collecting mechanism is further sent, and the presence or absence of buckling of the wire electrode is discriminated and detected by the buckling sensor. ) If buckling of the wire electrode is not detected in the item (d) or (i), after the roller device is opened and then stopped, the mounting state of the wire electrode on the traveling path is broken. It is determined by the detection device, (k) when it is determined in (j) that the wire electrode is mounted on the traveling path with a predetermined tension, it is determined that the insertion is successful, (l) When buckling of the wire electrode is detected in item (d) or (i), or in the previous item (h). If the buckling detection is not resolved even after repeating the relative movement of the predetermined pattern for the set number of times, or if it is not determined in (j) that the wire electrode is mounted on the travel route with a predetermined tension. ,
After the roller device is rotated in the reverse direction to wind up the wire electrode, the operation after the item (b) is repeated a set number of times, and if the insertion success is not determined even after repeating the set number of times, the insertion failure is determined. To do.

[0009]

According to the present invention, the wire electrode is loosened and comes into contact with the buckling sensor to determine the appearance of the inability to insert the wire. It is determined by the resolution. Therefore, in the present invention, the appearance of the impenetrable state and the elimination of the state are discriminated regardless of the contact / non-contact state change between the wire electrode and the workpiece. Further, in the present invention, the insertion of the wire electrode into the work piece after the determination that the wire cannot be inserted is not the rotation of the roller that presses and clamps the wire electrode, but the wire electrode in a sufficiently loosened state is pipe-shaped wire electrode guide body. It is carried out by ejecting from a jet stream ejected from. or,
Whether the wire electrode is loosened (buckled) by the buckling sensor after the wire electrode has been fed by the roller device to a length that allows the tip of the wire electrode to pass through the workpiece and reach the exit side of the machining start hole or machining groove Therefore, when the wire electrode is ready to be inserted and the wire electrode is ejected by the jet flow, the wire electrode penetrates all the way to the exit side such as the machining start hole of the workpiece. In addition, the pipe-shaped wire electrode guide is
It acts to restrain and guide the wire electrode near the upper surface of the workpiece along the planned insertion path. Further, after it is determined that the wire cannot be inserted, the impossible state is resolved by relatively moving the wire electrode guide body and the work piece in a predetermined pattern to change the positional relationship between them, and the relative movement of the predetermined pattern ( If the buckling detection is not resolved even after the search operation is completed, the search operation is repeated a preset number of times, and if the buckling detection is not resolved even after the search operation is repeated a set number of times. , The wire electrode is temporarily wound up, the insertion operation from the initial stage (referred to as a try operation) is performed again, and this try operation is repeated a predetermined number of times in advance, so that the maximum number of search operation times and the try Since the search operation is performed a number of times times the set number of operations, the probability of successful insertion of the wire electrode into the workpiece is increased. Further, when a wire electrode having a length such that the tip of the wire electrode reaches the capturing and collecting mechanism is fed, the wire disconnection detection device (disconnection detection limit switch) determines the tension state of the wire electrode.
Finally, it is accurately determined whether or not the wire electrode is properly mounted on the predetermined traveling route. Also, when buckling is detected before reaching the capturing and collecting mechanism after penetrating the work piece, or when it is determined by the disconnection detection limit switch that the wire electrode is not mounted with proper tension Since the trial operation is repeated up to the set number of times, the probability that the wire electrode can be mounted on the planned traveling route in the desired proper state is improved.

Further, in the first aspect of the present invention, after determining that the wire cannot be inserted, the tip of the wire electrode is in contact with the upper surface of the workpiece or the inner surface of the machining start hole while the jet stream is being ejected. When the wire electrode guide and the work piece are relatively moved in a predetermined pattern in a hooked state, the hooked state is resolved, and when the contact or hooking of the tip of the wire electrode is released, The resulting wire electrode is jetted by the jet flow and penetrates the workpiece.

Further, in the second aspect of the present invention, after it is determined that the wire cannot be inserted, the jetting of the jet flow is stopped and the tip of the wire electrode is in contact with the upper surface of the workpiece or the inner surface of the processing start hole or the like. The wire electrode guide body and the workpiece are relatively moved to the next point in the predetermined pattern in a state of being caught at the point, and the jet state is repeatedly ejected at the point to eliminate the caught state. When the contact or catching of the tip of the wire electrode is eliminated, the wire electrode in the free state is ejected by the jet flow and penetrates the workpiece.

According to the third aspect of the present invention, after determining that the wire cannot be inserted, the roller device is reversely rotated while the jet stream is being ejected to wind up the wire electrode and loosen the wire electrode sufficiently above the roller device. The contact or catching of the tip is eliminated, and in this state, the wire electrode guide body and the workpiece are relatively moved to the next point in the predetermined pattern, and the roller device is opened to release the pressing and pinching of the wire electrode. By injecting the wire electrode in the free state by a jet flow, the wire electrode can be inserted into the workpiece.

[0013]

1 is a schematic front view showing an embodiment of an apparatus for carrying out a wire electrode insertion method according to the present invention, in which 1 is a bed of a wire cut electric discharge machine and 2 is a bed 1 on the bed. Is a processing table movably provided in the X and Y axis directions to form an XY plane, and the workpiece 3 is fixedly mounted on a mounting table provided on the processing table 2. 4,5
Are X- and Y-axis drive motors for moving the machining table 2, and by controlling the driving of these motors, machining feed of a desired contour shape is given. Reference numeral 6 is a column that is provided upright on the bed 1, and reference numerals 7 and 8 are a pair of upper and lower arms that are extended from the column 6 onto the processing table 2 and are provided. Reference numerals 9 and 10 denote an upper nozzle device and a lower nozzle device for jetting a working liquid to the working portion, and position the wire electrode 11 of the working portion facing the workpiece 3 in the Z-axis direction orthogonal to the XY plane. As will be described later, a pair of guides are housed in the upper and lower nozzle devices 9 and 10 in such a manner that the guide portions can be opened and closed. Reference numeral 12 denotes a moving body that is supported by the upper arm 7 and moves in the Z-axis direction by driving the motor 13. An upper nozzle device 9 is fixed to a lower end portion of the moving body 12, and a lower nozzle device 10 is a lower arm. It is fixed to the tip of No. 8. In addition, the moving body 12 has a support plate 14
Is supported by the sliding guide 15 so as to be movable in the Z-axis direction, and the nut provided on the support plate 14 is attached to the moving body 12.
To the support plate 14 by engaging the Z-axis screw 16 provided on the
Moves in the Z-axis direction. In addition, a pipe-shaped wire electrode guide body 18 having both ends opened is provided on the support plate 14 coaxially with the nozzle devices 9 and 10 and the pair of positioning guides, and above the wire electrode guide body 18. Is a buckling sensor 19 that detects looseness of the wire electrode that occurs when the advance of the tip of the wire electrode is obstructed during the insertion operation. Further, above the buckling sensor 19, the wire electrode is pressed and pinched upward or downward. There is provided a roller device 20 for feeding to.
Further, the lower arm 8 is provided with a belt stretched between the rollers and wire electrode capturing / collecting mechanisms 22 and 23 for capturing the wire electrode between the belts and sending it into the collection container 21, and the wire electrode 11 is a supply reel. Guide roller 2 fed from 24
5, roller device 20, buckling sensor 19, wire electrode guide 18, upper nozzle device 9 (upper positioning guide), processing start hole or processing groove 26 of the workpiece 3, lower nozzle device 10 (lower positioning guide) Capture and collection mechanism 22, 2
It is mounted on a traveling path to the collection container 21 via 3 and travels with a predetermined tension and speed by the pulling force of the capturing and collecting mechanisms 22 and 23 or the pulling drive mechanism separately provided and the action of the brake mechanism 27. Further, 28 is a cutting device for cutting the wire electrode, 29 is a working liquid supply device for supplying a working liquid to the upper and lower nozzle devices 9 and 10 and the wire electrode guide body 18, and 30 is a wire electrode wound by a roller device 20. Is a slack receiving container 30 for storing the. Further, the upper arm 7 is provided with a wire breakage detection limit switch 31 constituting a wire wire breakage detection device, and detects a tension state of the wire electrode 11 by engaging a switch lever on the wire electrode 11 between the guide roller 25 and the brake mechanism 27. However, the switch is turned on only when the wire electrode 11 is traveling and moving with a predetermined tension.

Referring to FIG. 2, a pipe-shaped wire electrode guide 18 provided on the support plate 14, a buckling sensor 19, a roller device 20 and an upper nozzle device 9 (upper positioning guide) provided on the moving body 12 and a cutting device. The configuration around 28 will be described in detail. Reference numeral 18a denotes a pipe portion of the wire electrode guide body 18, and the pipe portion 18a has an inner diameter such that a gap between the diameter of the wire electrode and a multiple of the diameter is formed between the pipe portion 18a and the wire electrode inserted therein. However, it is usually made of stainless steel pipe. A machining liquid supply unit 18b having an inner diameter larger than the inner diameter of the pipe unit 18a is provided above the pipe unit 18a.
The high-pressure working liquid supplied to 8c flows through the pipe portion 18a and is ejected as a jet stream from the tip opening at the lower end.
A buckling sensor 19 is fixed to the upper side of the working fluid supply unit 18b. The buckling sensor 19 has an inner diameter of 5 to 6 mm to 10 or more.
mm, cylindrical wire electrode guide 18 with a vertical length of several cm
The support plate 14 and the working liquid supply portion 18b are insulated from each other, and the inner peripheral surface is made of a conductive material (for example, copper) 19a. A low voltage is applied between the wire electrode 11 and the conductive material 19a. In addition, the contact of the wire electrode with the inner peripheral surface is detected as an electric signal. Further, the hole 19b through which the wire electrode penetrates from the processing liquid supply portion 18b to the buckling sensor 19 is formed to have a diameter slightly larger than the diameter of the wire electrode in order to suppress leakage of the supplied processing liquid. The bottom plate (insulating material) is provided with a discharge port 19c for discharging the jetted machining liquid. The buckling sensor 19 does not necessarily have to be cup-shaped and provided with the discharge port 19c as shown in the drawing, but may be a simple cylindrical body. A roller device 20 is provided above the buckling sensor 19. Roller device 20
Is a capstan 2 that is rotationally driven by a motor 20a.
0b, the pinch roller 20c facing the capstan 20b in the direction orthogonal to the Z axis, and the pinch roller 20c.
Is constituted by a cylinder device 20d for advancing and retracting in the opposite direction, and is configured to freely press and clamp the wire electrode (roller close) and release the clamp (roller open). A slack receiving container 30 formed of an insulating material such as synthetic resin having an outer diameter substantially the same as or larger than that of the buckling sensor 19 is provided above the roller device 20. This slack receiving container 30
Is a container for accommodating the wire electrode wound up by the roller device 20. When the roller device 20 is in the pressure pinching release state (roller open state), the accommodated wire electrode is buckled sensor 19 A relatively large opening 30a is formed in the bottom plate so that the wire electrode guide member 18 can be smoothly dropped and moved. In addition, this slack receiving container 3
Zero is not always necessary, and it may be naturally loosened between the roller device 20 and the guide roller 25. These wire electrode guide 18, buckling sensor 19, roller device 2
0 and the slack receiving container 30 move integrally with the movement of the support plate 14, and the pipe portion 18a moves in the Z-axis direction with the XY plane position being restricted by the guide hole 32 formed in the moving body 12.

The nozzle body 9a of the upper nozzle device 9 provided at the lower end of the moving body 12 is coaxial with the guide hole 32 and has openings 9b and 9c larger than the outer diameter of the pipe portion 18a, and a working liquid supply device 29. Has a working liquid supply port 9d to which the pressurized working liquid is supplied, and a conducting member for the wire electrode and a guide member for positioning the wire electrode are housed therein. Reference numeral 33 is a V-groove guide, 34 is a conducting wire to which a power supply line from a machining power source is connected, and 35a and 35b are V-grooves, or one is a V-groove and the other is a flat split positioning guide. 33 and the positioning guide 35a are members 3
6, and the conduction member 34 and the positioning guide 35b are integrally fixed to the member 37.
Are configured to be movable back and forth in a direction orthogonal to the Z axis by cylinder devices 38 and 39, respectively. When the two members 36, 37 are separated from each other by driving the two cylinder devices 38, 39, the pipe portion 18a becomes movable from the upper opening 9b to the outlet side of the lower opening 9c as shown in FIG. After insertion of the wire electrode, in a state where both members 36 and 37 are brought close to each other, as shown in FIG. 2, the conduction electrode 34 comes into contact with the wire electrode 11 held by the V-groove guide 33 so that the wire electrode is energized and positioned. The guides 35a and 35b come into contact with each other to form a die-shaped positioning guide. Further, the upper opening 9b of the nozzle body 9a is formed to be slightly larger than the outer diameter of the pipe portion 18a, and it is supported so that the tip of the pipe portion 18a is located in the opening 9b during processing as shown in FIG. The plate 14 is arranged to prevent the working liquid supplied from the working liquid supply port 9d into the nozzle body 9a from being jetted upward from the opening 9b, and the supplied working liquid is supplied from the lower opening (nozzle port) 9c. Efficiently jetted and supplied to the processing section. Further, during machining, the machining liquid may be supplied to the nozzle body 9a not only from the machining liquid supply port 9d but also from the pipe portion 18a. Although the upper nozzle device 9 is shown in FIG. 2, the lower nozzle device 10 (FIG. 1) fixed to the tip of the lower arm 8 has the same configuration as the upper nozzle device 9, and is merely an energizing member. The V-groove guide 33 and the conduction member 34 and the positioning guides 35a and 35b are arranged so that their vertical positional relationship is reversed (the positioning guide is closer to the workpiece 3 like the upper nozzle device 9).
Reference numerals 40 and 41 denote cylinder devices provided in the lower nozzle device 10 (FIG. 1).

The cutting device 28 provided above the upper nozzle device 9 includes a cutter 28a, a receiving member 28b which faces the cutter 28a in a direction orthogonal to the Z axis, and a cutter 28a and a receiving member 28b. It is composed of cylinder devices 28c and 28d for advancing and retreating in the opposite direction, and when the wire electrode is disconnected during the machining or when the wire electrode is broken during the machining or the like, the machining start hole of the workpiece or the machining start hole When it is necessary to insert it into the already processed groove,
With the pressing and pinching by the roller device 20 released, the wire electrode guide 18 is moved upward from the position of FIG. 2 to position the tip of the pipe portion 18a above the cutter 28a, and then the cylinder device 28d is driven and received. After the member 28b is advanced to the position of the central axis of the pipe portion 18a, the cutter 28a is advanced by driving the cylinder device 28c to sandwich the wire electrode between the member 28b and the member 28b for cutting. By cutting the wire electrode at the position of the central axis of the pipe portion 18a, it is possible to cut the wire electrode with good straightness without causing bending at the tip end portion of the cut wire electrode.

Each of the above-mentioned cylinder devices is driven by an appropriate fluid pressure such as hydraulic pressure or air pressure. Further, instead of each cylinder device, a screw / nut mechanism, a cam mechanism, a link mechanism, a rack and pinion driven by a motor is used. It is possible to use a mechanism or a combination mechanism of a spring and an electromagnet depending on the purpose of movement.

FIG. 4 is a block diagram of the apparatus of the embodiment shown in FIG. 1. Reference numeral 42 denotes a central processing unit (CPU), which is a register unit used for storing data and the like, an arithmetic unit for arithmetically operating data and data. It has a control unit for controlling the transfer. 4
Reference numeral 3 is a storage device (ROM) for storing a program for inserting the wire electrode, 44 is information input from an input device 45 such as a keyboard and detection of a rotation speed detector (rotary encoder) 48 provided on the pinch roller 20c of the roller device. A storage device (RAM) for storing the wire electrode feed-out and winding length in each operation step by the roller device 20 calculated based on the signal, 46 is an input interface,
Reference numeral 47 denotes an output interface, which includes setting data by the input device 45, an output signal of the buckling sensor 19, an output signal of the disconnection detection limit switch 31, and a rotation speed detector 48.
According to the detection signal of the roller 43, the roller device 20, the capture and recovery mechanisms 22, 23, the brake mechanism 27, and the cutting device 2 are instructed by the CPU 42 according to the program stored in the ROM 43.
8, the operation of the machining liquid supply device 29, and the cylinder devices 38, 39, 40, 41 of the upper and lower nozzle devices are controlled, and the respective motors are numerically controlled.

The insertion operation is performed as follows by the apparatus of this embodiment. Prior to the start of the insertion operation, the roller device 20
The wire electrode feeding and winding speed by RA
It is stored in M44, and the length from the wire electrode cutting position (Z-axis position of the cutter 28a at the time of cutting) to the upper surface of the workpiece 3 and the plate thickness of the workpiece 3 are input by the input device 45. Based on these input and stored information, the CPU 42 adds a length of several mm to the length from the wire electrode cutting position on the planned traveling path to the lower surface of the workpiece 3 or further immediately before the positioning guide in the lower nozzle device 10 or the time T ₁ required to feed the length of the wire electrode until just after the lower nozzle device from the distal end position of the length delivery at said time T ₁ 1
The time T ₂ required to send out a wire electrode having a length until it reaches the wire electrode capturing / collecting mechanism 22 after passing through the positioning guide in 0 is stored in the RAM 44. Further, the input device 45 repeats the relative movement (search operation) of a predetermined pattern N ₁ and the insertion operation (try operation) from the initial stage N ₂ and N ₃ (N
₂ and N ₃ will be described later). The insertion operation is started in this state. or,
The braking force by the brake mechanism 27 is weakened during the insertion operation.

The procedure of the insertion operation performed by the command of the CPU 42 by the program stored in the ROM 43 will be described below with reference to a flowchart. 101 to 134, 201 to 23 in the flowcharts of FIGS.
6, 301 to 334 respectively indicate step numbers. FIG. 5 is a flowchart of the wire electrode insertion method according to the first aspect of the present invention. First, the count numbers n ₁ , n ₂ , and n ₃ of the search operation and the try operation are cleared and reset (step 101). When processing ends and moves to the next processing,
Alternatively, when the insertion operation is performed, for example, when the wire is broken during processing, the upper nozzle device 9 and the wire electrode guide body 18 are
The roller device 20 is in the pressing and pinching release state (roller open state). From this state, first, the motor 17 is driven to raise the pipe-shaped wire electrode guide 18 (support plate 14) to position the tip of the pipe portion 18a above the cutter 28a of the cutting device 28, and then the cylinder device 28.
d and 28c are sequentially driven to cut the wire electrode. The wire electrodes on the lower side of the cutting portion are capture and recovery devices 22, 23.
To a recovery container 21, and if the wire electrode is broken, the cut pieces are removed by appropriate means. For example, if necessary, the moving body 12 is moved upward by a predetermined length to move the nozzle opening 9c.
It is also possible to operate the wire cut piece holding / removing device provided on the moving body 12 to remove the cut pieces in a state where the distance between the work piece 3 and the workpiece 3 is widened. The cylinder device 20d is driven to bring the capstan 20b and the pinch roller 20c into contact with each other to bring the wire electrode pressing and sandwiching state (roller closed state) (step 102). After cutting the wire electrode, the moving body 12 is lowered to its original position. Cylinder device 38, 39, 40, 41
Is driven to drive the motor 17 in a state where the energizing members and the split positioning guides in the upper and lower nozzle devices are opened to lower the wire electrode guide body 18 to lower the tip of the pipe portion 18a to the upper surface of the workpiece 3. 3 is brought close to a distance of about 0.5 mm to obtain the state of FIG. At this time, the machining table is moved to a predetermined position by the NC program for machining feed, and the machining start hole 26 and the pipe portion 18a are coaxially aligned. In this state, a high-pressure machining liquid is supplied from the machining liquid supply device 29 to the machining liquid supply section 18b, and a jet stream is ejected from the tip of the pipe section 18a. A part of the jet flow jetted out diffuses and flows radially from between the tip of the pipe portion 18a and the upper surface of the workpiece 3, and the rest jets in the processing start hole or the processing groove. Next, the roller device 20 is rotated in the forward direction to feed the wire electrode downward (step 103). After sending out the wire electrode until the time T1 elapses (step 104), the buckling sensor 19 discriminates and detects the presence or absence of buckling (loosening) of the wire electrode (step 10).
5). When the buckling of the wire electrode is not detected, the presence or absence of buckling is discriminated and detected by the buckling sensor 19 while sending out the wire electrode until the time T2 elapses (steps 106 and 107). At this time, the capture and collection mechanism 22,
23 is being driven. When the buckling is not detected even after the elapse of the time T2, the roller device 20 is opened and the normal rotation is stopped (step 108). Next, the braking force of the brake mechanism 27 is increased to a predetermined braking force during processing,
After a predetermined pulling force is applied by the capturing and collecting mechanisms 22 and 23 and a waiting time of about several seconds or the like, a wire breakage detection device (breakage detection limit switch) 31 discriminates and detects the mounting state of the wire electrode on the traveling route ( Step 10
9) When it is detected that the wire electrode is mounted with a predetermined tension, it is determined that the insertion is successful (step 110), the jet flow is stopped, and the pipe-shaped wire electrode guide body (hereinafter, abbreviated as pipe) 18 Is moved to the position shown in FIG. 2 and processing is started. Further, when buckling is detected in step 106, it means that the tip of the wire electrode is caught on the traveling path from the lower surface side of the workpiece 3 to the capturing and collecting mechanism 22, and the progress is hindered. . At this time, the roller device 2
0 is stopped (step 111), 1 is added to the execution number n ₂ of the try operation (step 112), and the count number n ₂
Has reached the set number of times N ₂ (step 1
13) If the set number of times N ₂ has not been reached yet, the roller device 20 is reversely rotated to wind up the wire electrode (step 114). Here, the winding length is the feed length during the time T ₁ from the start of the time T ₂ to the step 1
It is a length added by the length further fed by the time when the buckling is detected in 06, and the tip of the wire electrode returns to the wire electrode cutting position after winding. Step 10
The length further sent in 6 is the time T _{2 of the} detector 48 for detecting the number of rotations of the pinch roller 20c of the roller device.
The roller device 20 is calculated by the detection output signal from the start to the buckling detection, or the elapsed time from the start of the time T ₂ to the buckling detection is detected.
It may be calculated by multiplying it by the delivery speed of, and the technical significance is the same. After winding the wire electrode in step 114, the process proceeds to step 103 again to retry insertion. If it is determined in step 113 that the count number n ₂ of execution times has reached the set number N ₂ , the count number n ₂ is cleared and reset to n ₂ = 0 (step 1
15). Next, after stopping the jet flow and moving the pipe upward (step 116), the roller device 20 is rotated in the reverse direction to wind up the wire electrode (step 11).
7). In the winding, the tip of the wire electrode is detected by a wire tip detecting device (for example, a blow sensor) and the wire is wound to a predetermined position above the upper surface of the workpiece 3. It is determined whether or not the count number n ₃ has reached the set number N ₃ (step 119), and if it has not yet reached the set number N ₃ , the same position as the cutting position in step 102 (the Z-axis position of the cutter 28a). ), The roller device 20 is reversely rotated to wind up the wire electrode, and the pipe 18 is lowered to the lowered position in step 102, and then the jet flow is ejected (step 11).
8). The winding length in step 118 is a distance for lowering the pipe or a distance obtained by adding the moving distance of the moving body 12 to the distance when moving the moving body 12 upward to cut the wire electrode. Will not be displaced and will be kept in the cutting position. Number of trial operation executions n
1 is added to ₃ (step 120), and then the process proceeds to step 103 again to retry insertion. As is apparent from the above description, the set number N ₂ of trial operations is an operation of retrying insertion without performing the wire electrode tip cutting process, and the set number N ₃ of try actions performs wire electrode tip cutting process. It is an operation to retry the insertion after that. For example, if N ₃ = 1 is set, the retry operation for performing the tip cutting process is performed once. Further, when the count number n3 is judged that reaches the set number of times N ₃ at step 119, to determine an insertion failure (Step 1
21), sound, light,
The operator is notified of the insertion failure by a display or the like, and the operation is terminated.
Further, when a large number of pieces are processed on one workpiece, the pipe 18 is aligned coaxially with the next processing start hole,
Steps 101 and below are performed again. The wire electrode tip treatment may be performed prior to step 101. If it is not detected in step 109 that a predetermined tension is applied to the wire electrode, it may be detected that there is a mounting failure such as the tip of the wire electrode being fed out of the predetermined traveling path. means. At this time, after closing the roller device 20 (step 122), the process proceeds to step 116, and if the set number of times has not been reached, the wire electrode tip cutting process is performed and the try operation is re-executed. Step 1
When the buckling is detected in 05, the roller device 20 is stopped (step 123). The buckling sensor 19 detects the buckling (loosening) of the wire electrode by sending out the wire electrode in step 103, as shown in FIG. Hole 26
Buckling sensor 1
When the buckling is detected in step 105, it is after the time T _{1 has} elapsed, so if the wire electrode tip is straightened, the buckling is detected. The state is shown in FIG. 9 in which a slack having a length that penetrates the processing start hole 26 of the workpiece 3 and reaches the outlet side is formed.

Next, while the jet stream is being jetted in the state shown in FIG. 9, the X and Y axis drive motors 4 and 5 are numerically controlled to start the movement of the workpiece 3 in a predetermined pattern relative to the pipe 18. (Step 124) It is judged whether or not the buckling detection by the buckling sensor 19 is canceled until the relative movement (search operation) of the predetermined pattern is completed (Step 1).
25, 126). Note that steps 124 to 126 are U-
The V axis may be moved. The movement pattern is a spiral movement with gradually increasing radius, a movement that sequentially changes the direction of the reciprocating linear movement, a movement that draws a petal of four quarts or more petals, an X-axis predetermined stroke, a Y-axis at a predetermined pitch, and XY For example, a movement for scanning a plane. Even if the tip of the wire electrode jumps and moves away from the work piece temporarily during relative movement, the wire electrode forms sufficient slack and contacts the buckling sensor, affecting the buckling detection signal. Therefore, it is possible to stably detect the impossibility of insertion. The tip of the wire electrode is in contact with the upper surface near the entrance of the processing start hole of the workpiece or the inner side surface of the hole, and the rigidity of the wire electrode is weak, but the wire electrode protrudes from the tip of the pipe 18. Since the length of the tip (usually around 0.5 mm) is short, the tip of the wire electrode follows the pattern movement while being pressed downward by the jet flow when it is in contact with the upper surface of the workpiece. If it slides on the top surface of the work piece and enters the processing start hole etc. to be in a free state, or if it is caught in the middle of the processing start hole etc., the pattern movement will eventually eliminate the catch and the tip of the wire electrode will disappear. Be free. At this moment, the slack of the wire electrode is vigorously ejected from the pipe 18 by the jet flow, and the jet flow is jetted into the processing start hole, so that the tip of the wire electrode is fed by the roller device. Even if a slight amount of momentum advances with this jet flow and some catching occurs on the inner side surface of the machining start hole, etc., the movement is not blocked there and the machining start hole, etc. is penetrated all at once and the outlet side And reaches the state shown in FIG. In this way, the wire electrode is inserted into the workpiece, and the buckling sensor 19
When the buckling detection due to is canceled, the search operation is stopped and the workpiece is returned to the search operation start position (step 12).
7). Next, the count number n ₁ of execution times of the search operation
And reset to n ₁ = 0 (step 12
8) The roller device 20 is normally rotated to feed the wire electrode downward (step 129), and the process proceeds to step 106. Further, the time T ₂ is started in synchronization with the start of the normal rotation of the roller device in step 129.

If the buckling detection is not resolved until the search operation is completed in step 126, 1 is added to the count number n ₁ of execution times of the search operation (step 130) and the count number n ₁ is set to the set number N ₁ It is determined whether or not has reached (step 131). When the search operation is completed in step 126, the workpiece 3 has returned to the relative movement start position of the predetermined pattern. Count number n _{1 in} step 131
Once but is determined to be not yet reached the set number N _1, the roller 20 is reversely rotated upwardly rolled up roller unit until the wire electrode tip is located 10~50mm about upwardly from the upper surface of the workpiece 3 After slackening is caused (step 132), the roller device is once opened and the wire electrode is allowed to fall freely and then closed (step 133). By this operation, the contact state between the wire electrode and the workpiece may be temporarily canceled and the wire electrode may be inserted into the machining start hole or the like during free fall. Then, after the roller device is closed in step 133, the process proceeds to step 124 to re-execute the search operation. If it is determined in step 131 that the count number n ₁ has reached the set number N ₁ , the count number n ₁ is cleared and reset to n ₁ = 0 (step 134), and then the process proceeds to step 112. If the set number of times has not been reached, the try operation is re-executed.

FIG. 6 is a flowchart of the wire electrode insertion method according to the second aspect of the present invention. The steps 201 to 223 in the second invention correspond to the steps 101 to 123 in the first invention of FIG. 5, respectively, and the operation procedures and technical contents are the same, so the description will be omitted. Omit it. In the second invention, the step 223 is in the state of FIG. 9, and in this state, after jetting of the jet flow is stopped (step 224), the X and Y axis drive motors 4,
5 is numerically controlled to move the workpiece 3 relative to the next point in the predetermined pattern with respect to the pipe 18 (step 225). Next, in a state where the jet flow is ejected (step 226), it is determined whether or not the buckling detection by the buckling sensor 19 has been resolved (step 227). Until the movement (search operation) ends, jetting of the jet flow is stopped, the jet flow is jetted to the next point, the jet flow is jetted, and the operation of the steps 224 to 227 for discriminating the elimination of the buckling detection is repeated (step 228). ). The pattern of point movement is similar to that of the first invention. Further, the mode of contact between the tip of the wire electrode and the workpiece during relative movement is the same as in the case of the first invention, and the wire electrode is sufficient even if the tip of the wire electrode jumps and temporarily leaves the workpiece. Since the slack is formed and the buckling sensor is in contact with the buckling sensor, the buckling detection signal is not affected, and the insertion-impossible state is stably detected. However, in the case of the first aspect of the invention, the jet flow is continuously ejected during the relative movement, so that the liquid flow radially diffuses from the gap between the tip of the pipe portion 18a and the upper surface of the workpiece 3 though the gap is a slight gap. There is a risk that the tip of the thin wire electrode will slip out as the wire moves, but according to the second aspect of the invention, jetting of the jet stream is stopped during relative movement. When the tip of the wire electrode is in contact with the upper surface of the work piece, the tip of the wire electrode slides on the upper surface of the work piece while following the point movement while being pressed downward by the jet flow, and then the machining start hole is formed. Etc., it becomes a free state, and when it is caught in the middle of the processing start hole etc., the point movement eventually eliminates the catch and the tip of the wire electrode becomes a free state. At this moment, the slack of the wire electrode is vigorously ejected from the pipe portion 18a by the jet flow, and the jet flow is jetted into the processing start hole, so that the tip of the wire electrode is not fed by the roller device. Even if it advances with this jet flow with a much larger momentum than the case and some catch is generated on the inner side surface of the processing start hole, etc., it will not be stopped there and will immediately penetrate through the processing start hole etc. and exit. It reaches the side, and the state shown in FIG. 10 is reached. In this way, when the wire electrode is inserted into the workpiece and the buckling detection by the buckling sensor 19 is eliminated, the workpiece is returned to the position where the point movement was started (step 229).
Next, after clearing the count number n ₁ of execution times of the search operation and resetting n ₁ = 0 (step 230),
The roller device 20 is normally rotated to feed the wire electrode downward (step 231), and the process proceeds to step 206.
Further, the time measurement of the time T2 is started in synchronization with the start of the normal rotation of the roller device in step 231.

If the buckling detection is not resolved by the end of the search operation in step 228, 1 is added to the count number n ₁ of execution times of the search operation (step 232), and the count number n ₁ is set to the set number N ₁ It is determined whether or not has reached (step 233). When the search operation is completed in step 228, the workpiece 3 has returned to the relative movement start position of the predetermined pattern. Count number n1 in step 233
If it is determined that the number of times N1 has not reached the set number of times, the roller device 20 is rotated in the reverse direction to wind up until the tip of the wire electrode is located about 10 to 50 mm above the upper surface of the workpiece 3 and loosen above the roller device. (Step 234), the roller device is once opened and the wire electrode is allowed to fall freely and then closed (step 235). By this operation, the contact state between the wire electrode and the workpiece may be temporarily canceled and the wire electrode may be inserted into the machining start hole or the like during free fall. Then, after the roller device is closed in step 235, the process moves to step 224 to re-execute the search operation by moving the points. or,
When it is determined in step 233 that the count number n ₁ has reached the set number N ₁ , the count number n ₁ is cleared to n.
After resetting to ₁ = 0 (step 236), the process proceeds to step 212, and if the set number of times has not been reached, the try operation is re-executed.

FIG. 7 is a flowchart of the wire electrode insertion method according to the third aspect of the present invention. The steps 301 to 323 in the third invention correspond to the steps 101 to 123 in the first invention of FIG. 5, respectively, and the operation procedures and technical contents are the same, so the description will be omitted. Omit it. In the third invention, in the state of FIG. 9 in step 323, the roller device 20 is reversely rotated while the jet stream is being jetted in this state so that the tip of the wire electrode is about 10 to 50 mm above the upper surface of the workpiece 3. Pipe part 1
It is wound up until it is positioned in the center 8a to cause looseness above the roller device (step 324). The wire electrode wound up here is accommodated in the slack receiving container 30 to be in the state of FIG. 11, and at this time, the buckling detection signal by the buckling sensor 19 disappears. Then, X and Y axis drive motors 4, 5
Is numerically controlled to move the work piece 3 relative to the next point in the predetermined pattern with respect to the pipe 18 (step 325), the roller device 20 is once opened, and the wire electrode is set in a free state and loosened. Pipe part 1 by jet flow
8a is vigorously ejected, and after the movement of the wire electrode due to the ejection is stopped, the roller device 20 is closed (step 326). Here, immediately before the roller device 20 is opened, the roller device 20 is reversely rotated to slightly (about 5 to 10 mm) instantaneously pull up the wire electrode against the jet flow, and It is possible to correct the bending property of the portion and improve the straightness, and increase the probability of entering the processing start hole or the like. Next, at step 327, it is determined whether or not the buckling detection by the buckling sensor 19 has been eliminated. In step 326, when the roller device is opened to inject the wire electrode and the tip of the wire electrode cannot enter the processing start hole or the like and is caught, the slack receiving container 30
The wire electrode corresponding to the amount of slack inside slides into the buckling sensor 19 and becomes the state of FIG. 12, and it is not determined that the buckling detection has been eliminated. At this time, a relative movement of a predetermined pattern (search operation)
Until the end, the wire electrode is wound up to the next point and the roller device is opened, and then the operations of steps 324 to 327 for determining whether to cancel the buckling detection are repeated (step 328). The pattern of point movement is similar to that of the first invention. However, in the first invention, there is a possibility that the tip of the wire electrode may flow out from the gap between the tip of the pipe portion 18a and the upper surface of the workpiece due to the relative movement under the jet flow ejection. There is no fear. Further, in the second invention, a complicated operation of repeating jetting and stopping of the jet flow is required, but in the third invention, the jet flow is always in a jetting state, and such a complicated operation is not required. If the tip of the wire electrode ejected vigorously by the jet flow when the roller device is opened in step 326 enters into the machining start hole or the like in which the jet flow is ejected, the tip of the wire electrode is moved to the roller device. Even if the inner surface of the machining start hole, etc. gets caught by the jet flow with a significantly larger momentum than in the case of feeding by, the machining start hole etc. is penetrated at once without being blocked. Then, it reaches the exit side and becomes the state of FIG. In this way, when the wire electrode is inserted into the workpiece and it is determined that the buckling sensor 19 has eliminated the buckling detection, the workpiece is returned to the position where the point movement started (step 329). Next, after the count number n ₁ of execution times of the search operation is cleared and reset to n ₁ = 0 (step 330), the roller device 20
Is rotated forward to feed the wire electrode downward (step 331), and the process proceeds to step 306. Also, step 3
In synchronization with the start of normal rotation of the roller device at 31, the time measurement of the time T ₂ is started.

When it is not determined in step 328 that the buckling detection is canceled until the search operation is completed, 1 is added to the count number n ₁ of execution times of the search operation (step 33).
2) It is determined whether or not the count number n ₁ has reached the set number N ₁ (step 333). When the search operation is completed in step 328, the workpiece 3 has returned to the relative movement start position of the predetermined pattern. When it is determined in step 333 that the count number n ₁ has not reached the set number N ₁ yet, the process proceeds to step 224, and the search operation by moving the points is re-executed. If it is determined in step 333 that the count number n ₁ has reached the set number N ₁ , the count number n ₁ is cleared and reset to n ₁ = 0 (step 334), and then the process proceeds to step 312 and is set. If the number of times has not been reached, the try operation is re-executed.

In the case of the above-mentioned embodiment, when the relative movement (search operation) of the predetermined pattern is difficult to insert, at most N ₁ ×
Since it is performed N ₂ × N ₃ times, the probability of successful insertion is extremely high. As the set number of times for the search operation and the try operation, N ₁ = 1 to 3, N ₂ = 2 to 5, and N ₃ = 1 to 2 are appropriate.

Further, steps 132 and 13 in FIG.
3, the operation of winding the wire electrode to once open the roller device and then to close the roller device in steps 234 and 235 in FIG. 6 is an operation procedure provided in some cases and is not always necessary.

Further, in each of the inventions shown in FIGS. 5, 6 and 7, when the step 134, 236, 334 is followed by the retry operation, the delivery length at the time T ₂ is zero, The winding length of 114, 214, 314 is the feeding length at the time T ₁ .

In each of the inventions shown in FIGS. 5, 6 and 7, buckling is detected while the time T _{2 has} elapsed and steps 111,
When retrying from 211 and 311, 114 and 2
When the wire electrode is wound up at 14 and 314 and the retry operation is performed, when the try operation is re-executed, when the roller device is stopped at steps 123 (FIG. 5), 223 (FIG. 6) and 323 (FIG. 7) , Steps 134, 236, 3
A slack is formed above the roller device (in the slack receiving container 30) except when shifting from 34 to the retry operation. In addition to this slack, that is, the amount of delivery at T ₁ ,
The length added up from the start of the time T ₂ to the detection of buckling is added up. Similarly, the time T
Buckling is detected during the course of ₂ steps, and steps 117, 217,
When the wire electrode is wound at 317 and the retry operation is started, in addition to the delivery amount at T ₁ , the time T ₁
It is the length obtained by subtracting the length of the tip of the wire electrode cut in steps 120, 220, 320 from the length sent from the start of + T ₂ until buckling detection, and this length may be negative. In that case, the slack is not formed. Further, since the mounting state with a predetermined tension is not detected by the disconnection detection limit switch, the step 117,
When the wire electrode is wound at 217 and 317 and the retry operation is started, the length is the length obtained by subtracting the length of the wire electrode tip portion cut at steps 120, 220 and 320 from the feed length during the time T2. is there. Therefore, the length of the slack is calculated from each data of the length sent from the start of the time T ₂ to the buckling detection, the sending length during the time T ₂ , and the length of the wire electrode cutting tip. CP
It may be calculated in U42 and stored in the RAM 44. Steps 132, 133 (FIG. 5), 23 for winding the wire electrode described above in the first invention (FIG. 5) or the second invention (FIG. 6) to once open and then close the roller device.
In the case of 4, 235 (FIG. 6), step 132 or 23
In step 4, the wire electrode is wound by a length equal to the delivery length in the time T ₁ , and then step 133.
Since the roller is opened at 235, steps 123 and 22 are performed.
The search operation is re-executed with the same amount of slack as when the search operation is started from 3. Further, in the third invention (FIG. 7), after the roller device is once opened and closed in step 326, the slack is wound up and the slack is similarly compensated and adjusted, and then in step 327. Try to determine whether there is buckling.

[0031]

EFFECTS OF THE INVENTION According to the present invention, the length of the wire electrode passing through the work piece is determined in order to determine whether the wire electrode cannot be inserted into the work piece, not in the contact / non-contact state between the wire electrode and the work piece. After sending out the wire electrode, it buckles (slacks) on the wire electrode
Since it is determined by detecting whether or not the occurrence of the occurrence, the appearance and the elimination of the impenetrable state can be stably and accurately determined and detected. Further, when it is determined that the insertion is impossible, a slack of a length that passes through the workpiece is formed, and in this state, a predetermined pattern is formed between the pipe-shaped wire electrode guide body that ejects the jet flow and the workpiece. Since the relative movement (search operation) is performed to eliminate the impenetrable state, when the wire electrode tip is caught by the search operation, the wire electrode is ejected vigorously by the jet flow and the machining start hole etc. It can be penetrated to reach the outlet side, and can also be inserted with high probability into a small-diameter processing start hole or a processed groove having a small gap with the wire electrode. Further, even if some catch is generated on the inner side surface of the hole, the wire penetrates all at once without hindering its progress, so that an extremely fine wire electrode which has low rigidity and tends to be caught can be inserted with high probability. or,
If the buckling detection is not resolved by the search operation, the same search operation is repeated a set number of times.If the buckling detection is still not resolved, the insertion operation (try operation) from the initial stage is repeated and this try operation is performed. Also, since the set number of times is repeated, the search operation is performed a maximum number of times times the set number of times, which also increases the probability of successful insertion into the workpiece. Further, when the wire electrode penetrates to the exit side of the workpiece, the presence or absence of buckling is detected while further sending out the wire electrode having a length such that the tip of the wire electrode reaches the capturing and collecting mechanism, and the formation of buckling is determined. When the buckling is not detected, the wire breakage detection device (break break detection limit switch) is used to determine the mounted state of the wire electrode. The probability that the wire electrode can be mounted in the state is improved, and finally it can be accurately determined whether or not the wire electrode is properly mounted on the predetermined traveling route.

Further, according to the first aspect of the present invention, since the insertion operation is performed in the state where the jet stream is constantly ejected, the operation procedure is simple and the wire electrode can be efficiently inserted into the workpiece. Further, in the second invention, since the relative movement to the next point in the predetermined pattern is performed in a state where the jet flow is stopped, the wire electrode is inserted from the gap between the tip of the pipe-shaped wire electrode guide and the workpiece. There is no risk that the tip of the will flow out due to the diffusing fluid flow. Further, in the third aspect of the invention, although the jet flow is constantly ejected, the relative movement to the next point in the predetermined pattern is performed with the tip of the wire electrode positioned in the pipe-shaped wire electrode guide. There is no risk that the tip of the wire electrode will slip out of the gap between the tip of the wire electrode guide and the workpiece, and the complicated operation of repeatedly jetting and stopping the jet stream is not required. Further, in the third invention, after the relative movement to the next point in the predetermined pattern, the roller device is rotated in the reverse direction immediately before the roller device is opened so that the wire electrode is moved in the pipe-shaped wire electrode guide body. If the wire is pulled up momentarily against the jet flow, the bending property of the tip can be corrected and the straightness of the wire electrode can be improved for injection, and the probability of entering the processing start hole is increased. To be enhanced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration front view showing an embodiment of an apparatus for carrying out a wire electrode insertion method of the present invention.

2 is a partial sectional view showing a state during processing in the apparatus of the embodiment shown in FIG.

FIG. 3 is a partial cross-sectional view showing a state when an insertion operation is performed in the embodiment apparatus shown in FIG.

FIG. 4 is a block diagram of the embodiment apparatus shown in FIG.

FIG. 5 is a flowchart of the wire electrode insertion method of the first invention of the present invention.

FIG. 6 is a flowchart of the wire electrode insertion method of the second invention of the present invention.

FIG. 7 is a flowchart of a wire electrode insertion method according to a third invention of the present invention.

FIG. 8 is an explanatory diagram showing a state when slack of the wire electrode is detected by a buckling sensor.

FIG. 9 is an explanatory view showing a loosened state of the wire electrode when the buckling sensor determines that the wire cannot be inserted.

FIG. 10 is an explanatory view showing a state when the wire electrode is inserted into the workpiece in the first invention and the second invention of the present invention.

FIG. 11 is an explanatory view showing a state when the wire device is wound up by rotating the roller device in the reverse direction in the third aspect of the invention.

12 is an explanatory view showing a state in which the wire electrode is not inserted into the workpiece when the roller device is opened in the state of FIG. 11 in the third aspect of the invention. FIG.

FIG. 13 is an explanatory view showing a state in which the wire electrode is inserted into the workpiece when the roller device is opened in the state of FIG. 11 in the third aspect of the invention.

[Explanation of symbols]

1: Bed 2: Processing table 3: Work piece 4, 5: X and Y axis drive motor 6: Column 7,
8: Upper and lower arms 9, 10: Upper and lower nozzle device 11: Wire electrode 1
2: Moving body 13: Motor 14: Support plate 15: Sliding guide 1
6: Z-axis screw 17: Motor 18: Pipe-shaped wire electrode guide
19: Buckling sensor 20: Roller device 21: Wire electrode collection container 22, 23: Wire electrode capture and collection mechanism 24: Supply reel 25: Guide roller 26: Processing start hole or processing groove 2
7: Brake mechanism 28: Cutting device 29: Processing liquid supply device 30: Slack receiving container 31: Wire breakage detection device (breakage detection limit switch) 32: Guide hole 33: V groove guide 34: Conductor 35a, 35b: Split mold Positioning guides 20d, 28c, 28d, 38, 39, 40, 41: Cylinder device 42: Central processing unit (CPU) 43: ROM 4
4: RAM 45: Input device 46, 47: Input / output interface 48: Roller rotation speed detector

Claims (3)

[Claims] 1. A pair of positioning guides are provided on both sides of a workpiece fixedly mounted on an XY plane, and the pair of positioning guides positions the workpiece in a Z-axis direction orthogonal to the XY plane. The thin wire wire electrode mounted on the predetermined traveling path from the supply reel to the capturing and collecting mechanism in the state of being inserted into the object is axially moved and moved at a predetermined tension and speed to move the wire electrode and the workpiece. In the state where the machining liquid is supplied to the machining gap between the two, a voltage pulse is intermittently applied between them to repeatedly generate electric discharge, and a relative machining feed on the XY plane is given to machine the desired contour shape. A wire-cut electric discharge machine for carrying out, which is a cylindrical body having an inlet end and an outlet end of a wire electrode at both ends, is arranged coaxially with the pair of positioning guides and is movable in the Z-axis direction, and in the vicinity of the inlet end. From pressurized fluid And a roller device provided on the inlet end side of the wire electrode guide body for pressing and pinching the wire electrode and sending the wire electrode in the axial direction. A buckling sensor provided between the entrance end of the electrode guide body and the roller device for detecting buckling of the wire electrode, a wire disconnection detecting device for detecting a tension state of the wire electrode on the traveling path, and a predetermined position. In a method of inserting a wire electrode in a wire-cut electric discharge machine equipped with a cutting device for cutting the wire electrode, (a) after the wire electrode is cut at a predetermined position by the cutting device, the outlet end is covered. After moving the wire electrode guide in the Z-axis direction to a position close to the workpiece, the roller device is closed to press and hold the wire electrode and pressurize fluid to the wire electrode guide. It is supplied to eject a jet stream from the outlet end of the guide body, (b) the roller device is rotated forward to deliver the wire electrode toward the wire electrode guide body, and (c) the tip of the wire electrode is processed. After the wire has passed through the object, the presence or absence of buckling of the wire electrode is detected by the buckling sensor. (D) If no buckling of the wire electrode is detected in (c) above, the tip of the wire electrode is detected. Until the wire electrode capture and recovery mechanism is further sent, the presence or absence of buckling of the wire electrode is detected and detected by the buckling sensor, and (e) The buckling of the wire electrode is detected in (c) above. Then, the roller device is stopped, and (f) it is determined whether or not the buckling detection is canceled while applying a predetermined relative movement of a predetermined pattern on the XY plane between the wire electrode guide and the workpiece. (G) In item (f) above, buckling test is performed until the relative movement of the predetermined pattern is completed. When the knowledge is not resolved, the relative movement of the predetermined pattern is repeated a set number of times, and (h) When the cancellation of the buckling detection is determined in the item (f),
After returning to the relative movement start position of the predetermined pattern, the roller device is rotated in the forward direction until the wire electrode tip reaches the wire electrode capturing and collecting mechanism, and the presence or absence of the buckling of the wire electrode is checked while further feeding. (B) If the wire electrode buckling is not detected in item (d) or (h), the roller device is opened and stopped, and then the wire electrode travels. The mounting state on the route is determined by the wire disconnection detection device, and (j) when it is determined in (i) that the wire electrode is mounted on the traveling route with a predetermined tension, Whether the insertion is successful, (k) When buckling of the wire electrode is detected in the item (d) or (h), or when the relative movement of the predetermined pattern is repeated a set number of times in the item (g). When the buckling detection is not resolved, or when the wire electrode runs in the above (i) When it is not determined that the wire device is mounted on the row path with a predetermined tension, the roller device is reversely rotated to wind up the wire electrode, and
A method of inserting a wire electrode in a wire-cut electric discharge machining apparatus, characterized in that the operation after the item (b) is repeated a set number of times, and if insertion is not successful even after the set number of times is repeated, insertion failure is determined. 2. A pair of positioning guides are provided on both sides of the workpiece fixedly mounted on the XY plane, and the pair of positioning guides position the workpiece in the Z-axis direction orthogonal to the XY plane. The thin wire wire electrode mounted on the predetermined traveling path from the supply reel to the capturing and collecting mechanism in the state of being inserted into the object is axially moved and moved at a predetermined tension and speed to move the wire electrode and the workpiece. In the state where the machining liquid is supplied to the machining gap between the two, a voltage pulse is intermittently applied between them to repeatedly generate electric discharge, and a relative machining feed on the XY plane is given to machine the desired contour shape. A wire-cut electric discharge machine for carrying out, which is a cylindrical body having an inlet end and an outlet end of a wire electrode at both ends, is arranged coaxially with the pair of positioning guides and is movable in the Z-axis direction, and in the vicinity of the inlet end. From pressurized fluid And a roller device provided on the inlet end side of the wire electrode guide body for pressing and pinching the wire electrode and sending the wire electrode in the axial direction. A buckling sensor provided between the entrance end of the electrode guide body and the roller device for detecting buckling of the wire electrode, a wire disconnection detecting device for detecting a tension state of the wire electrode on the traveling path, and a predetermined position. In a method of inserting a wire electrode in a wire-cut electric discharge machine equipped with a cutting device for cutting the wire electrode, (a) after the wire electrode is cut at a predetermined position by the cutting device, the outlet end is covered. After moving the wire electrode guide in the Z-axis direction to a position close to the workpiece, the roller device is closed to press and hold the wire electrode and pressurize fluid to the wire electrode guide. It is supplied to eject a jet stream from the outlet end of the guide body, (b) the roller device is rotated forward to deliver the wire electrode toward the wire electrode guide body, and (c) the tip of the wire electrode is processed. After the wire has passed through the object, the presence or absence of buckling of the wire electrode is detected by the buckling sensor. (D) If no buckling of the wire electrode is detected in (c) above, the tip of the wire electrode is detected. Until the wire electrode capture and recovery mechanism is further sent, the presence or absence of buckling of the wire electrode is detected and detected by the buckling sensor, and (e) The buckling of the wire electrode is detected in (c) above. Then, the roller device is stopped, and (f) the jet flow is stopped, and then the wire electrode guide body and the workpiece are moved to the next point of the predetermined pattern on the XY plane set in advance. After relative movement, jet flow is ejected to determine whether buckling detection has been eliminated However, (g) If it is not determined in step (f) that the buckling detection has been eliminated, the above-mentioned procedure is performed until the relative movement of the predetermined pattern is completed.
If the buckling detection is not canceled until the relative movement of the predetermined pattern in (h) above is repeated in (h) above, the operation in (f) above is repeated, and the predetermined pattern according to the above (f) and (g) Repeating the relative movement a set number of times, (i) If it is determined that the buckling detection has been eliminated in (f) above,
After returning to the relative movement start point, the roller device is rotated in the forward direction until the wire electrode tip reaches the wire electrode capturing and collecting mechanism, and further the wire electrode is buckled to determine whether or not the wire electrode is buckled. (J) When the buckling of the wire electrode is not detected in (d) or (i), the roller device is opened and stopped, and then the wire electrode on the travel route is detected. When the wire breakage detection device determines the mounting state, and (k) when it is determined in (j) that the wire electrode is mounted on the traveling route with a predetermined tension, the insertion is successful. (L) When buckling of the wire electrode is detected in (d) or (i) above, or even when the relative movement of the predetermined pattern is repeated a set number of times in (h) above, buckling is detected. Is not resolved, or the wire electrode is placed on the travel route in (j) above. When it is not determined that the wire device is mounted with a predetermined tension, the roller device is reversely rotated to wind up the wire electrode, and
A method of inserting a wire electrode in a wire-cut electric discharge machining apparatus, characterized in that the operation after the item (b) is repeated a set number of times, and if insertion is not successful even after the set number of times is repeated, insertion failure is determined. 3. A pair of positioning guides are provided on both sides of a workpiece fixedly mounted on the XY plane, and the pair of positioning guides position the workpiece in the Z-axis direction orthogonal to the XY plane. The thin wire wire electrode mounted on the predetermined traveling path from the supply reel to the capturing and collecting mechanism in the state of being inserted into the object is axially moved and moved at a predetermined tension and speed to move the wire electrode and the workpiece. In the state where the machining liquid is supplied to the machining gap between the two, a voltage pulse is intermittently applied between them to repeatedly generate electric discharge, and a relative machining feed on the XY plane is given to machine the desired contour shape. A wire-cut electric discharge machine for carrying out, which is a cylindrical body having an inlet end and an outlet end of a wire electrode at both ends, is arranged coaxially with the pair of positioning guides and is movable in the Z-axis direction, and in the vicinity of the inlet end. From pressurized fluid And a roller device provided on the inlet end side of the wire electrode guide body for pressing and pinching the wire electrode and sending the wire electrode in the axial direction. A buckling sensor provided between the entrance end of the electrode guide body and the roller device for detecting buckling of the wire electrode, a wire disconnection detecting device for detecting a tension state of the wire electrode on the traveling path, and a predetermined position. In a method of inserting a wire electrode in a wire-cut electric discharge machine equipped with a cutting device for cutting the wire electrode, (a) after the wire electrode is cut at a predetermined position by the cutting device, the outlet end is covered. After moving the wire electrode guide in the Z-axis direction to a position close to the workpiece, the roller device is closed to press and hold the wire electrode and pressurize fluid to the wire electrode guide. It is supplied to eject a jet stream from the outlet end of the guide body, (b) the roller device is rotated forward to deliver the wire electrode toward the wire electrode guide body, and (c) the tip of the wire electrode is processed. After the wire has passed through the object, the presence or absence of buckling of the wire electrode is detected by the buckling sensor. (D) If no buckling of the wire electrode is detected in (c) above, the tip of the wire electrode is detected. Until the wire electrode capture and recovery mechanism is further sent, the presence or absence of buckling of the wire electrode is detected and detected by the buckling sensor, and (e) The buckling of the wire electrode is detected in (c) above. Then, the roller device is stopped, and (f) the roller device is reversely rotated to wind up the wire electrode until the tip of the wire electrode is positioned in the wire electrode guide body, and then the preset XY plane is set. To the next point of the above predetermined pattern, After the pole guide and the workpiece are moved relative to each other, the roller device is opened and it is determined whether or not the buckling detection is eliminated. (G) When the elimination of the buckling detection is not determined in (f) above, , Until the relative movement of the predetermined pattern is completed
If the buckling detection is not canceled until the relative movement of the predetermined pattern in (h) above is repeated in (h) above, the operation in (f) above is repeated, and the predetermined pattern according to the above (f) and (g) Repeating the relative movement a set number of times, (i) If it is determined that the buckling detection has been eliminated in (f) above,
After returning to the relative movement start point, the roller device is rotated in the forward direction until the wire electrode tip reaches the wire electrode capturing and collecting mechanism, and further the wire electrode is buckled to determine whether or not the wire electrode is buckled. (J) When the buckling of the wire electrode is not detected in (d) or (i), the roller device is opened and stopped, and then the wire electrode on the travel route is detected. When the wire breakage detection device determines the mounting state, and (k) when it is determined in (j) that the wire electrode is mounted on the traveling route with a predetermined tension, the insertion is successful. (L) When buckling of the wire electrode is detected in (d) or (i) above, or even when the relative movement of the predetermined pattern is repeated a set number of times in (h) above, buckling is detected. Is not resolved, or the wire electrode is placed on the travel route in (j) above. When it is not determined that the wire device is mounted with a predetermined tension, the roller device is reversely rotated to wind up the wire electrode, and
A method of inserting a wire electrode in a wire-cut electric discharge machining apparatus, characterized in that the operation after the item (b) is repeated a set number of times, and if insertion is not successful even after the set number of times is repeated, insertion failure is determined.